Stabilization of the microtron-injector for a wide-band compact FIR FEL

Kazakevitch, Grigori M.; Jeong, Young Uk; Pavlov, V. M.; Lee, Byung Cheol

doi:10.1016/b978-0-444-51727-2.50032-8

Cited by 3 publications

(4 citation statements)

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“…of the dynamic control of the injectio m modeling the transient processes in the 2.8 GHz, 2.5 MW magnetron, [7][8][9], and study of the transfer characteristic, phase performances, and phase noise spectra measured at various setups with CW, 1 kW magnetrons, injectionlocked by the phase-modulated signal.…”

Section: Features Of Magne Injection-locked By a Phase-modulated Signalmentioning

confidence: 99%

“…One of the primary concerns of using the magnetron transmitter to power superconducting cavities is the management of phase with a Low Level RF (LLRF) system generating a controlling signal which slowly varies phase on input of a 2-stage frequency-locked magnetron. The task is formally similar to one considering operation of a magnetron locked by slowly varying frequency/phase, [3][4][5]. This task was successfully solved theoretically considering the frequency-locked magnetron as a forced oscillator and proven experimentally [ibid].…”

Section: Introductionmentioning

confidence: 99%

“…Unlike Adler's approach [6], the developed technique analysing transient process in the locked magnetron allows numerical simulations of the frequency/phase deviations in time domain. Analysis of the simulations, successful experiments with the frequency-locked magnetrons, [3][4][5][6][7][8], and particularly our experimental results obtained with a frequency-locked 2stage (cascade) magnetron model, [9] motivated our concept of the high power 650 MHz frequency-locked magnetron transmitter with a phase and power control.…”

Section: Introductionmentioning

confidence: 99%

“…A proof-of-principle of the phase control of a magnetron, injection-locked by a frequency (phase)-modulated signal first has been demonstrated modelling a transient process in the 2.5 MW, 2.8 GHz pulsed magnetron type MI-456A, forced (injection-locked) by a signal with varied frequency, [7][8][9]. The transient process model was verified with very good accuracy by the measurements of the magnetron frequency (phase) response, [ibid.].…”

Section: Introductionmentioning

confidence: 99%

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High-power magnetron transmitter as an RF source for superconducting linear accelerators

Kazakevich

Johnson

Flanagan

et al. 2014

Nuclear Instruments and Methods in Physics Research Section A:

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A concept of a high-power magnetron transmitter utilizing the vector addition of signals of Continuous Wave (CW) magnetrons, injection-locked by phase-modulated signals, and intended to operate within a wideband control feedback loop in phase and amplitude, is presented. This transmitter is proposed to drive Superconducting RF (SRF) cavities for intensity-frontier GeV-scale proton/ion linacs, including linacs for Accelerator Driven System (ADS). The transmitter performance was verified in experiments with CW, S-Band, 1 kW magnetrons. A wideband dynamic control of magnetrons, required for the superconducting linacs, was realized using the magnetrons, injectionlocked by the phase-modulated signals. The capabilities of the magnetrons injection-locked by the phase-modulated signals and adequateness for feeding of SRF cavities have been verified by measurements of the transfer function magnitude characteristics of single and 2-cascade magnetrons in the phase modulation domain, by measurements of the magnetrons phase performance and by measurements of spectra of the carrier frequency of the magnetrons. At the ratio of power of locking signal to output power of ≥ -13 dB (in 2-cascade scheme per magnetron, respectively) we demonstrated a phase modulation bandwidth of over 1.0 MHz for injection-locked CW single magnetrons and a 2-cascade setup, respectively. The carrier frequency spectrum (width of ~ 1 Hz at the level of <-60 dBc) of the magnetron, injection-locked by a phase-modulated signal, did not demonstrate broadening at wide range of magnitude and frequency of the phase modulation. The wideband dynamic control of output power of the transmitter model has been first experimentally demonstrated using two CW magnetrons, combined in power and injection-locked by the phasemodulated signals. The experiments with the injection-locked magnetrons adequately emulated the wideband dynamic control with a feedback control system, which will allow to suppress parasitic modulation of the accelerating field in the SRF cavities, resulted from mechanical noises, phase perturbations, caused by cavity beam loading and cavity dynamic tuning errors, low-frequency ripples of the magnetron power supplies, etc. The magnetron transmitter concept, tests of the transmitter models and injection-locking of magnetrons by phase-modulated signals are discussed in this work.

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Section: Features Of Magne Injection-locked By a Phase-modulated Signalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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